Abstract: A drill chuck of the angularly sliding jaw type including a jaw actuating nut and a sleeve associated with the nut mounted on the body of the chuck, various forms of abutment means being provided for retaining the sleeve in its required position relative to the nut.

Abstract: A drill chuck of the key or Jacobs type comprising a chuck body guiding a plurality of chuck jaws toward and away from one another with axial displacement of the jaws by a gear ring whose teeth mesh with the Jacobs key. The toothed ring is formed with a groove in which a sleeve into which an inwardly projecting ridge of a sleeve is form-fittingly driven in the assembly of the chuck, the sleeve retaining the ring and another chuck member in axially fixed relation, this other chuck member being provided with an internally threaded bore for mounting upon a drill or other machine tool spindle. Directly opposite the shoulder formed by the groove in the toothed ring, the sleeve is provided with an inwardly open circumferential groove to facilitate plastic deformation of the sleeve into the groove of the ring.

Abstract: A chuck with key tightening, for a machine such as an electric drilling machine, comprising gripping means for gripping a tool such as jaws, which are guided in a translatory movement in grooves which are inclined with respect to the longitudinal axis of the chuck and which are machined in the chuck body, the chuck being characterized in that it comprises a toothed ring to which a tightening nut is connected, the nut cooperating with the threads of the gripping means, the toothed ring being provided in the region of its teeth with at least one retaining region whose internal diameter is smaller than the external diameter of the tightening nut, at least one component or at least one group of components having the same function, movable with respect to the chuck body, that is to say, the jaws and/or the nut and/or the toothed ring, being of sintered metal.

Abstract: A rotary spindle of a drill mount has a free end provided with a thread whose angle of rise is so selected that its tangent is at least equal to the coefficient of static friction of steel on steel.

Abstract: A tool chuck for drills and the like including a body having gripping jaws slideably supported in tapered ways formed in the body. A split nut rotatably supported on the body threadedly engages the jaws and is operable to engage and release the jaws from a bit. The nut and body are interfitted to rotatably support and axially retain the nut on the body. A cup is fitted on the nut to hold it together and on the body and, together with the interfitted body and nut, protects the internal chuck parts from dirt and other foreign material.

Abstract: A chuck body has one end for connection to a power tool, and another end from which a plurality of jaws project. A sleeve turnably surrounds the body and jaws and is operative, when turned in one direction, for moving the jaws inwardly towards one another into engagement with a tool bit that is located between them. A plate spring is mounted at the one end of the body and has a circumferential marginal portion which engages and frictionally locks the sleeve when the latter is turned in the aforementioned one direction.